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Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Interfaces and Thin Films and Responsive and Adaptive Systems

CPP 37.6: Talk

Thursday, September 8, 2022, 12:15–12:30, H39

Superlatice deformation via uniaxial strain and its impact on photoluminescence in PbS quantum dot thin films — •Julian E. Heger1, Wei Chen1, Huaying Zhong1, Tianxiao Xiao1, Constantin Harder1,2, Fabian A. C. Apfelbeck1, Alexander Weinzierl1, Regine Boldt3, Lucas Schraa3, Eric Euchler3, Anna K. Sambale3, Konrad Schneider3, Matthias Schwartzkopf2, Stephan V. Roth2,4, and Peter Müller-Buschbaum1,51TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2DESY, 22607 Hamburg — 3Leibniz-Institut für Polymerforschung IPFDD, 01069 Dresden — 4Royal Institute of Technology KTH, 100 44 Stockholm — 5MLZ, TU München, 85748 Garching

Colloidal lead sulfide quantum dots (PbS CQDs) show high potential for the application in flexible electronics, as they are solution processible with tunable optoelectronic properties. In thin films, PbS CQDs form a superlattice morphology that tailors these optoelectronic properties. For instance, electronic coupling between adjacent PbS CQDs is dependent on the inter-dot distance in the superlattice. In this work, we investigate the superlattice deformation during applied external strain. For this, PbS CQDs thin films are prepared on flexible PDMS substrates. The samples are investigated with in situ GISAXS and photoluminescence measurements at different levels of strain to correlate the deformation-induced morphological changes to the optoelectronic performance.

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